Central Bureau for Astronomical Telegrams
IAUC 8066: 2002kk, 2003ae
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Circular No. 8066
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2002kk AND 2003ae
Further to IAUC 8060, W. M. Wood-Vasey, G. Aldering, P. Nugent,
and B. Farris, Lawrence Berkeley National Laboratory (LBNL), report
the discovery of an apparent supernova (mag 19.4) on unfiltered
NEAT images taken with the Palomar 1.2-m Schmidt telescope on 2002
Aug. 15.44, 15.45, and 15.46 UT. SN 2002kk is located at R.A. =
21h58m58s.65, Decl. = -0 08'23".5 (equinox 2000.0). Additional
unfiltered CCD magnitude estimates for SN 2002kk: 2002 Aug. 5,
[20.5 (S/N = 3); 18, 19.2; 26, 19.0; Sept. 5, 19.5; 27, 20.1; 28,
20.2; Oct. 8, 20.8; 13, [20.5; 22, [20.5; Nov. 15, [20.5. There is
possible evidence for a faint underlying object (at mag 22.0, S/N =
3.6) at the position of SN 2002kk in a stack of 22 images taken
during 2001 Aug. 10-2002 July 12; otherwise, no host galaxy was
specified.
L. Wang, G. Aldering, S. Perlmutter, and W. M. Wood-Vasey,
LBNL, report that a spectrum (range 450-1000 nm) of SN 2002kk,
obtained on 2002 Nov. 9 UT with the Keck II telescope (+ ESI
spectrograph), showed it to be a type-Ia supernova about two months
after maximum. The spectrum is consistent with a spectrum of SN
1991T taken at 67 days past maximum. This approximate date is
consistent with the date of maximum derived from the unfiltered
photometry, which gives Aug. 26 +/- 2 days for the maximum (or 74
days before the spectrum was taken). Based on an overall chi**2
minimization fit of the spectrum compared with SN 1991T, Wang et al.
find a redshift of z = 0.09 for SN 2002kk.
Wood-Vasey, Aldering, and Nugent also report the discovery of
an apparent supernova (mag 17.9) on unfiltered Palomar NEAT images
taken on 2003 Jan. 23.38 and 23.40 UT. SN 2003ae is located at
R.A. = 9h28m22s.58, Decl. = +27o26'40".7 (equinox 2000.0), which is
0".3 west and 0".3 north of the center of the apparent host galaxy.
Additional magnitudes for SN 2003ae: 2002 Dec. 14, [20.5 (S/N = 3);
2003 Jan. 10, [20.5; Jan. 24, 17.6; 28, 17.1.
Further to IAUC 8064, T. Matheson, P. Challis, and R. Kirshner
report that a spectrum (range 370-750 nm) of SN 2003ae, obtained by
M. Calkins on Feb. 6.29 UT with the 1.5-m telescope, shows it to be
a type-Ia supernova before maximum: "Narrow emission lines
superposed on the spectrum of the supernova indicate a recession
velocity of 9600 km/s for the host galaxy. Using this value, the
supernova expansion velocity is about 13400 km/s for Si II (rest
635.5 nm). The spectral-feature age of the supernova is 7 +/- 2
days before maximum light; note that the discovery image was taken
fourteen days before this spectrum. Photometry to determine the
date of maximum would be most useful to constrain the rise time of
type-Ia supernovae."
(C) Copyright 2003 CBAT
2003 February 6 (8066) Daniel W. E. Green
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